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    <TITLE>io package</TITLE>
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<h3>Overview</h3>
The package contains classes used for building and writing
down the tree structure (load/save).

<h3>Class Structure</h3>

<pre>

  TreeInputSource             TreeOutputResult
       |                           |
  TreeBuilder                 TreeWriter
       |                           |
       *---------> Tree -----------+

</pre>

<dl>
<dt>TreeInputSource <dd>interface representing a source providing a builder
available to build a tree instance from the source.
<dt>TreeStreamSource <dd>TreeInputSource implemenation
reading data from SAX's InputSource.

<dt>TreeBuilder <DD>interface with buildDocument() returning a tree instance
It returns XML or DTD tree depending on the source that provided it.
<dt>TreeStreamBuilderXercesImpl <dd>TreeBuilder implementation
provided by TreeStreamSource

<dt>TreeOutputResult <dd>provides getWriter() returning writer writing to
some output representation
<dt>TreeStreamResult <dd>implementation of TreeOutputResult

</dl>
<h4>SAX EntityResolver Replacement</h4>

<dl>
<dt>TreeEntityResolver <dd>an interface
<dt>TreeEntityManager  <dd>the void implementation
</dl>

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